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

struct WordData {
    char word[101];
    char letter;
};
 
 int countOccurence(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 = countOcuurence(data);
     if(result == 0)
     {
         printf("-1");
     }
     else
     {
         printf("%d",result);
     }
     
     return 0;
 }