#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 1e6 + 10, INF = 0x3f3f3f3f, MOD = 1E9 + 7;

int main(int argc, char* argv[]) {
    char a;
    string b;
    int T;
    cin >> T;
    while (T--) {
        cin >> a >> b;
        a = tolower(a); // 转小写
        int cnt = 0;
        for (auto u : b)
            cnt += (a == tolower(u));
        cout << fixed << setprecision(5) << 1.0 * cnt / b.size() << endl;
    }
    return 0;
}