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Problem Statement You have to find the perfect number. Given that it is a positive , with no leading zeros and has exactly x digits in it. Suppose this integer is y if you move the last digit to the front then that integer will be z times of y. So, given integers, x and z find that perfect integer. The perfect integer should be minimum possible value. If an integer that meets this condition is not possible, return '-1'.

Constraints 1<=x<=3*10^4 1<=z<=9

Sample input 6 5

Sample output 142857
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