#include <bits/stdc++.h> using namespace std; int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int N,M; string S; cin >> N >> M >> S; int cnt = 2*N+2*M; vector<int>sum(cnt+1),sum2(cnt+1); for(int i = 0; i < cnt; i++) { sum[i+1] = sum[i]+(S[i] == 'A'); } for(int i = cnt-1; i >= 0; i--) { sum2[i] = sum2[i+1]+(S[i] == 'A'); } int res = 0; for(int i = cnt-1; i >= 0; i--) { if(S[i] == 'W') res++; if(res > sum2[i]) { cout << "No" << "\n"; return 0; } } res = 0; for(int i = 0; i < cnt; i++) { if(S[i] == 'C') res++; if(res > sum[i]) { cout << "No" << "\n"; return 0; } } cout << "Yes" << "\n"; }