CF612A.The Text Splitting

You are given the string $s$ of length $n$ and the numbers $p,q$ . Split the string $s$ to pieces of length $p$ and $q$ .

For example, the string "Hello" for $p=2$ , $q=3$ can be split to the two strings "Hel" and "lo" or to the two strings "He" and "llo".

Note it is allowed to split the string $s$ to the strings only of length $p$ or to the strings only of length $q$ (see the second sample test).

The first line contains three positive integers $n,p,q$ ( $1<=p,q<=n<=100$ ).

The second line contains the string $s$ consists of lowercase and uppercase latin letters and digits.

If it's impossible to split the string $s$ to the strings of length $p$ and $q$ print the only number "-1".

Otherwise in the first line print integer $k$ — the number of strings in partition of $s$ .

Each of the next $k$ lines should contain the strings in partition. Each string should be of the length $p$ or $q$ . The string should be in order of their appearing in string $s$ — from left to right.

If there are several solutions print any of them.