Greatest Common Divisor

Write a program that reads two positive integers from the standard input and determines their greatest common divisor.

Input Specification

The input contains two positive integers separated by a space character.

Output Specification

The program should write a single line to the standard output containing the greatest common divisor of the two input number.

Sample Input 1

1. 15 10

Output for Sample Input 1

1. 5

Sample Input 2

1. 2 7

Output for Sample Input 2

1. 1

Possible solutions: main1.c and main2.c.