Task: Program Execution
Input (English): 19, 21, ['6911', 'W', '6285', '6669', 'c', 'R', '9455', 'B', '585', '8007', '9597', '4007', '8317', '6113', 'I', 'h', '8983', '9553', 'z', '1885', 'F', 'l', '9883', 'L', 'U']
Output (English): F1885z