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# Problem U

The Weight Of Words

You are asked to write an AI that can play this game!

## Input

The input consists of a single line with two integers $l$ ($0 < l \le 40$) and $w$ ($0 < w \le 1000$).

## Output

Output a string of length $l$ with weight $w$ consisting of lowercase English
letters if it exists, otherwise output `impossible`. If more than one string exists, you
may output any of them.

Sample Input 1 | Sample Output 1 |
---|---|

11 131 |
programming |

Sample Input 2 | Sample Output 2 |
---|---|

7 96 |
contest |

Sample Input 3 | Sample Output 3 |
---|---|

26 677 |
impossible |