#include <bits/stdc++.h>   using namespace std;   const double sn = 1e-6;   int n, k;   char arr[55][10];   string s[55];   string res[55];   int main() {     scanf( %d%d , &n, &k);     for (int i = 0; i < n - k + 1; i++) {       scanf( %s , arr[i]);       string st(arr[i]);       s[i] = st;     }     string val =  Aa ;     for (int i = 0; i < n - k + 1; i++) {       if (s[i] ==  NO ) {         if (res[i] !=   ) {           res[i + k - 1] = res[i];           continue;         }         res[i] = val;         res[i + k - 1] = val;         val[1] = val[1] + 1;         if (val[1] >  z ) {           val[0] = val[0] + 1;           val[1] =  a ;         }       }     }     for (int i = 0; i < n; i++) {       if (res[i] ==   ) {         res[i] = val;         val[1] = val[1] + 1;         if (val[1] >  z ) {           val[0] = val[0] + 1;           val[1] =  a ;         }       }     }     for (int i = 0; i < n; i++) {       printf( %s , res[i].c_str());       if (i != n - 1) printf(   );     }     printf(  n );     return 0;   }   