Decoder

#include <stdio.h>

char findChar(char keys[], char target){
    char normal[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    int res;
    for(int i=0;i<26;i++){
        if(keys[i]==target){
            return normal[i];
        }
    }
}

int main(){
    int tc;
    scanf("%d",&tc);
    for(int i=1;i<=tc;i++){
        int n,m,in,index=0;
        scanf("%d %d",&n,&m);
        char keys[n][27];
        char words[m+1];
        char res[m];
        for(int j=0;j<n;j++){
            scanf("%s",&keys[j]);
        }
        scanf("%s",words);
        for(int j=0;j<m;j++){
            scanf("%d",&in);
            res[j] = findChar(keys[in-1],words[j]);
        }
        printf("Case #%d: ",i);
        for(int j=0;j<m;j++){
            printf("%c",res[j]);
        }
        printf("\n");
    }
    return 0;
}