Problem 47970. Cipher or decipher the number according to the second input - 10 keys

There are several bugs in the testsuite:

1) You cannot call cyp((x,y)) with double parantheses (occures twice)
2) for x='97256528638204' the string is too short. Likely there is a leading zero missing.

A few of the errors have been fixed, but this problem is too cryptic (or erroneous) for me to understand it, so I can't completely fix it. @Sibi, please fix the problem. I would highly recommend providing your own reference solution on the Edit page to ensure that it is working properly.