Task: Program Execution
Input (English): 15, 21, ['1269', '7597', '1559', '4137', 'U', 'W', '4725', 'i', '4431', '8213', 'i', 'e', '4311', '5749', 'Z', 'C', '4087', '119', 'E', 'n', '9239', '5711', 'R', '8911', 'C']
Output (English): ZC4087119En9239