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//                                       Bismillahir Rahmanir Rahim
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
#define all(x)       (x).begin(), (x).end()
#define asort(s)     (sort(s.begin(), s.end()))
#define REV(v)       (reverse(v.begin(),v.end()))
#define count_n(v,n) (count(v.begin(),v.end(),n))
#define max_v(a)     (*max_element(a.begin(),a.end()))
#define t_sum(sv)    (accumulate(sv.begin(),sv.end(),0ll))
#define mini_v(a)    (*min_element((a).begin(), (a).end()))
#define dsort(s)     (sort(s.begin(), s.end(),greater <>()))
#define binary(b,value) (binary_search(b.begin(),b.end(),value))
#define uper_b(b,value) (upper_bound  (b.begin(),b.end(),value))
#define Low_b(b,value)  (lower_bound  (b.begin(),b.end(),value))
#define scan(n,x)    for(ll i=0 ; i<n ; i++) {ll nx; cin >> nx; x.pb(nx);}
#define print(x)     for(auto &value : x){ cout << value << " ";}cout << endl;  
#define sz(v)        ((ll)(v).size())
#define cos(a)       cos(a*pi/180)
#define sin(a)       sin(a*pi/180)
#define tan(a)       tan(a*pi/180)
ll sum_digit(ll x) { ll sum=0; while(x>0){ sum+=x%10; x/=10; } return sum; }
ll reverse_num(ll n){ ll tmp=n, ans=0, r; while(tmp>0){ r=tmp%10; ans=ans*10+r; tmp/=10; } return ans; }
#define scanv(n,v) for(i=0;i<n;i++){ll x; cin>>x,v.pb(x);}
#define pi 3.141592654
#define pb           push_back
#define w(n)         while(n--)
#define f            first
#define s            second
#define nl           "\n"
#define bye          break;
#define edl          cout<<endl;
#define YES          cout << "YES" << endl;
#define NO           cout << "NO"  << endl;
#define Yes          cout << "Yes" << endl;
#define No           cout << "No"  << endl;
#pragma GCC optimize("Ofast")
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
bool is_not_prime[10001]; ll n =1000; vector<ll>primes;
void seive()
{
   ll i,j;
   is_not_prime[0]=1; is_not_prime[1]=1;
   for(i=2;i<=sqrt(n);i++) {  if(is_not_prime[i]==0) { primes.pb(i); for(j=i*i;j<=n;j+=i) { is_not_prime[j]=1; } }  }
}
int main()
{
    ll t;
    cin >> t;
    ll x,y;
    cin >> x >> y;
    if(t == 1)
    {
        if(x == y && y == 0)
        {
            cout << 1 << endl;
            cout << 0 << ":" << 0 << endl;
        }
        else
        {
            cout << 1 << endl;
            cout << x << ":" << y << endl;
        }
    }
    else if((x+y) <= t)
    {
        cout << t - (x+y) << endl;
        for(ll i=1; i<=x; i++)
        {
            cout << 1 << ":" << 0 << endl;
        }
        for(ll i=1; i<=y; i++)
        {
            cout << 0 << ":" << 1 << endl;
        }
        for(ll i=1; i<=(t-(x+y)); i++)
        {
            cout << 0 << ":" << 0 << endl;
        }
    }
    else if( (x+y) > t)
    {
        cout << 0 << endl;
        ll match = t-2;

        for(ll i=1; i<=match; i++)
        {
            if(x >= 1)
            {
                cout << 1 << ":" << 0 << endl;
                x--;
            }
            else if(y >= 1)
            {
                cout << 0 << ":" << 1 << endl;
                y--;
            }
        }
        if(x==0 || y == 0)
        {
            if(x == 0)
            {
                cout << 0 << ":" << 1 << endl;
                cout << 0 << ":" << (y-1) << endl;
            }
            else
            {
                cout << 1 << ":" << 0 << endl;
                cout << (x-1) << ":" << 0 << endl;
            }
        }
        else
        {
            cout << x << ":" << 0 << endl;
            cout << 0 << ":" << y << endl;
        }
    }
    return 0;
}