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.
Add two numbers
wait for me
High school cafeteria
Find the magnetic field around the wire
Find the efficiency
find the index of local minimum in the matrix
Cipher and Decipher the message - same key for all digits
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