#include<stdio.h>
#include<string.h>
struct vidyuth
{
    char str[100],ch;
};
int main(){
    struct vidyuth king;
    char str[100],ch;
    int i, count=0,n,p;
    scanf("%s",king.str);
    scanf("% c",&king.ch);
    n=strlen(king.str);
    for (i=0;i<n;i++)
    {
      if (king.str[i]==king.ch)
      {
          count++;
      }
    }
    if(count==0)
    {
        printf("-1");
    }
    else
    {
        printf("%d", count);
    }
};