First pair with frequency sum over limit X87305

Given a sequence of integers we are interested in frequencies of the sums of consecutive number pairs. For instance, the sums of consecutive number pairs of the input sequence $5, 7, 6, 5, 8, 4, 5$ are $12, 13, 11, 13, 12, 9$. Note that pair sums $12$ and $13$ have frecuency two, and the first pair in the sequence achieving a frecuency sum greater than one is $5, 8$. Write a program that given a limit $k$ and a sequence of integers computes the first pair of consecutive numbers achieving a frequency sum greater than $k$. For instance, provided that $k$ is one and given the previous input sequence the first pair achieving a frequency sum greater than $k$ is $5, 8$.

Input

Input consists of a nonnegative integer $k$ followed by a sequence of two or more integers.

Output

The first pair of consecutive numbers in the input sequence achieving frequency sum greater than $k$. If there is no such a pair, the message not found must be printed.