4 Strings

Given two strings $S_1$ and $S_2$ , you have to print which string is lexicographically smaller. If string $S_1$ is smaller print $1$ else if $S_2$ is smaller print $2$ otherwise print $0$ , if both string are same. String $p$ is lexicographically smaller than string $q$, if $p$ is a prefix of $q$, is not equal to $q$ or there exists $i$, such that $p_i < q_i$ and for all $j < i$ it is satisfi