C :

#include<stdio.h>

int main()
{
	int b,i,k;
	char a[1001];
	while(scanf("%s%d",a,&b)!=EOF)
	{
		for(k=i=0;a[i]!='\0';i++)
			k=(k*10%b+(a[i]-'0')%b)%b;
		printf("%d\n",k);
	}
	return 0;
}

C++ :

#include<stdio.h>

int main()
{
	int b,i,k;
	char a[1001];
	while(scanf("%s%d",a,&b)!=EOF)
	{
		for(k=i=0;a[i]!='\0';i++)
			k=(k*10%b+(a[i]-'0')%b)%b;
		printf("%d\n",k);
	}
	return 0;
}

Java :

import java.util.*;
import java.math.*;
import java.io.*;

public class Main {
	public static void main(String[] args){
		Scanner sf=new Scanner(System.in);
		BigInteger a,b;
		while(sf.hasNext()){
			a=sf.nextBigInteger();
			b=sf.nextBigInteger();
			a=a.mod(b);
			System.out.println(a);
		}
	}
}