#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 = countOccurrence(data);
       if(result == 0)
       {
           printf("-1");
       }
       else
       {
           printf("%d",result);
       }
       return 0;
}