#job 25

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h>int digit(int n,int k){int i,m,count;count = 1;if(n < 0)n = -n;while (n/(int)pow(10,count)>=1)count++;if(k > count || k < 1)return -1;else{for(i=1;i<k;i++)n=n/10;m=n%10;return m;}}int main(){int n;int k;while(scanf("%d%d",&n,&k)){if(n==0)break;elseprintf("digit(%d,%d) = %d\n",n,k,digit(n,k));}}