#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc,char *argv[]){
    FILE *fp;
    int i=0,j=0,k;
    fp=fopen(argv[1],"r");
    int sor,osz;
    fscanf(fp,"%d %d",&sor,&osz);
    char *s=calloc(sor*osz,sizeof(char));
    s[0]='\0';
    char c;
    while((c=fgetc(fp))!=EOF){
        if(c>='0' && c<='9'){
            printf("%d\n",j);
            sor=c-'0';
            fscanf(fp,"%d",&osz);
            s=calloc(sor*osz,sizeof(char));
            s[0]='\0';
            j=i=0;

        }
        if((c>='A') && (c<='Z')){
          j++;
          for(k=0;k<=i;k++){
            if(c==s[k]){
                j--;
                break;
            }
          }
          s[i]=c;
          i++;
        }
    }
    printf("%d\n",j);
    return EXIT_SUCCESS;
}