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#include<bits/stdc++.h>
using namespace std;
int sum(int a,int b,int c){
if(c>1 && c<=9){
return c;
}
else{
return sum(a,b,c);
}
}
int main(){
int n,m,s=0;
cin>> n;
// if(n>=0 && n<=9){
// cout<<n<<endl;
// }
/*else{*/
m=n%10;
s=s+m;
n=n/10;
cout<< sum(n,m,s)<<endl;
/*}*/
return 0;
}
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