#include<stdio.h>
#include<string.h>
struct Data d;
{
   char word[101];
   char ch;
};


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;
}