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

struct WordData {
    char word[101];
    char letter;
};

int countOccurrence(struct WordData w) {
    int count = 0;
    for(int i=0;i<strlen(w.word); i++)
    {
        if(w.word[i] == w.letter) {
            count++;
        }
    }
    return count;
}
int main()
{
     struct WordData data;
     scanf("%s",data.word);
     scanf(" %c",&data.letter);
     int result =  countOccurence(data);
     if(result == 0)
      {
      printf("-1");
      }
      else
      {
          printf("%d",result);
      }
      
      return 0;
}