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