If string=aabbccc and Int 2
output=ccc ......It will remove aabb as their count match with enter int.
If string=aaabbccc and Int 3
output=bb
If string=aaabbccc and Int 1
output=aaabbccc output will be same as none of the character match with entered string.
If string=abc Int 1
output= output will be empty as the as all character matched with entered string