Task: Program Execution
Input (English): 6, 15, ['7411', '7517', 'y', '8385', '7061', 'N', 'U', '1355', '171', '2971', '3529', 'f', '9415', 'w', 'e', 'z', 'E', 'A', 'p', 'J']
Output (English): NU135517129713529f9415we