#include "testlib.h"
#include <iostream>
#include <cassert>
#include <atcoder/dsu>

const int MIN_N = 1;
const int MAX_N = 100000;

const int MIN_M = 1;
const int MAX_M = 1000000000;

const int MIN_A = 0;
const int MAX_A = 998244353 - 1;

int main(int argc, char** argv) {
    registerValidation(argc, argv);

    const int n = inf.readInt(MIN_N, MAX_N, "N");
    inf.readSpace();
    const int m = inf.readInt(MIN_M, MAX_M, "M");
    inf.readEoln();

    for (int i = 0; i < n; ++i) {
        inf.readInt(MIN_A, MAX_A, "A");
        if (i + 1 < n) {
            inf.readSpace();
        }
    }
    inf.readEoln();

    const std::string s = inf.readToken();
    assert((int)s.size() == m);
    for (const char c : s) {
        assert(c == 'a' || c == 's');
    }
    inf.readEoln();

    inf.readEof();
    return 0;
}