gcd

#include<stdio.h>
#include<algorithm>
#include<iostream>
#include<string.h>
#include<stdio.h>
using namespace std;
int gcd(int a,int b)
{
    if(a<b)swap(a,b);

    int t=b;
    while(t)
    {
        t=a%b;
        a=b;
        b=t;
    }
    return a;
}
int main()
{
    int n,m;
    while(~scanf("%d%d",&n,&m))
    {
        printf("%d\n",gcd(n,m));
    }
    return 0;
}