#define _CRT_SECURE_NO_WARNINGS
#define _SILENCE_CXX17_C_HEADER_DEPRECATION_WARNING
#include <bits/stdc++.h>
using namespace std;
#define CRP(t, x) const t &x
#define OPL(t, x) bool operator<(CRP(t, x)) const
#define FIL(x, v) memset(x, v, sizeof(x))
#define CLR(x) FIL(x, 0)
#define NE1(x) FIL(x, -1)
#define INF(x) FIL(x, 0x3f)
#ifndef _DEBUG
#define _DEBUG 0
#endif // !_DEBUG
#define IFD if (_DEBUG)
typedef long long ll, i64;
const int N = 1e6 + 60;
char s[N], p[3];
int main()
{
    int T, n;
    scanf("%d", &T);
    while (T--)
    {
        int ans = 1;
        scanf("%d%s%s", &n, p, s);
        for (int i = 0; i < n; i++)
            if (s[i] != *p)
            {
                ans = ((n - i) << 1) - (abs(s[i] - *p) < 10);
                break;
            }
        printf("%d\n", ans);
    }
    return 0;
}