Untitled

#include <bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL);

const long long val = 1e18;
long long fib[90];
int final_one = 0;

pair<long long ,long long> get(long long i, long long index) {
    if (i <= 2)
        return {i, index};
    if (i > final_one)
        return get(i - 1, index);
    if (index <= fib[i - 1])
        return get(i - 1, index);

    return get(i - 2, index - fib[i - 1]);
}

void solve()
{
    int n, m; cin >> n >> m;
    string s[2]; cin >> s[0] >> s[1];
    long long x, k; cin >> x >> k;
    fib[1] = n;
    fib[2] = m;
    for (int i = 3; i < 90; ++i) {
        fib[i] = fib[i - 1] + fib[i - 2];
        if (fib[i] >= val) {
            final_one = i;
            break;
        }
    }
    pair<long long, long long> ans = get(x, k);
    cout << s[ans.first - 1][ans.second - 1];
}

int main()
{
    fast;
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    freopen("Error.txt", "w", stderr);
#endif
    int t = 1; cin >> t;
    for (int i = 1 ; i <= t; ++i)
    {
        solve();
        if (i != t) cout << '\n';
    }
    return 0;
}