#include <stdio.h>

int main () {
  int n = 0;
  char ng[1001] = "";
  
  int res = 0;
  
  char ans[1001] = "";
  
  res = scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    res = scanf("%s", ng);
    ans[i] = 'a';
    if (ng[i] == 'a') {
      ans[i] = 'b';
    }
  }
  
  ans[n] = '\0';
  printf("%s\n", ans);
  return 0;
}