The crypto system in question is based on phone keyboard. We need two numbers in order to decrypt a word. First number represents relevant letters on a phone keyboard. We must sort all possible (meaningful or meaningless) string permutations. then select next number(th) word from this permutation list.
For example if input is [2 1];
there are three letters on phone keyboard '2' which is 'abc'. We sort this letters as {'a';'b';'c'} then select first one. Output is 'a'.
Another example if input is [2639 99]
output must be 'cody', since from all sorted possible string permutations with {'abc','mno','def','wxyz'} the 99th is 'cody'.
This one is related with Problem 1124
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George Berken Nikolaos Nikolaou David Hill Christian Schröder

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