#include<stdio.h>
#include<string.h>
struct same 
{
    char string[101];
    char ch;
};
int main()
{
    struct same s;
    scanf("%s",s.string);
    scanf("%c",&s.ch);
    for(int i=0;s.string[i]!='\0';i++)
    {
        int count=0;
        if(s.string[i]==s.ch)
        {
        count++;
        }
        return count;
    }
    if(count==0)
    {
        printf("-1");
    }
    else
    {
        printf("%d",count);
    }
    return 0;
}