c++ language

You are given a sequence of integers of length n and integer number k. You should print any integer number x in the range of [1; 10] (i.e.1 Sxs 10) such that exactly k elements of given sequence are less than or equal to x. Note that the sequence can contain equal elements. If there is no such x, print"-1" (without quotes). Input The first line of the input contains integer numbers n and k (1 <>