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