
# Documentation

## Remove common characters and concatenate

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#### Problem Statement

Given two strings s1 and s2. Modify string s1 such that all the common characters of s1 and s2 is to be removed and the uncommon characters of s1 and s2 is to be concatenated.

Note: If no modification is possible print -1.

    Example 1:

    Input:
    2
    aacdb
    gafd
    azcz
    cczca

    Output:
    cbgf
    -1






#### Solution

To be added soon ... .. ...


