#include <bits/stdc++.h>
using namespace std;
const int maxlongint = 2147483647;
const int inf = 1000000000;
char s[10], a[1000][1100];
;
int main() {
  scanf("%s", s);
  int n;
  cin >> n;
  for (int i = 1; i <= n; i++) scanf("%s", a[i]);
  int ans = 0;
  for (int i = 1; i <= n; i++) {
    if (a[i][0] == s[0] && a[i][1] == s[1]) ans = 1;
    for (int j = 1; j <= n; j++)
      if (a[i][1] == s[0] && a[j][0] == s[1]) ans = 1;
  }
  if (ans)
    printf("YES");
  else
    printf("NO");
}
