A10461. Complicated GCD

Greatest common divisor $GCD(a,b)$ of two positive integers $a$ and $b$ is equal to the biggest integer $d$ such that both integers $a$ and $b$ are divisible by $d$ . There are many efficient algorithms to find greatest common divisor $GCD(a,b)$ , for example, Euclid algorithm.

Formally, find the biggest integer $d$ , such that all integers $a,a+1,a+2,...,b$ are divisible by $d$ . To make the problem even more complicated we allow $a$ and $b$ to be up to googol, $10^{100}$ — such number do not fit even in 64-bit integer type!

The only line of the input contains two integers $a$ and $b$ ( $1<=a<=b<=10^{100}$ ).

Output one integer — greatest common divisor of all integers from $a$ to $b$ inclusive.