Task: Program Execution
Input (English): 1, ['Z', '8471', 'U', 'A', 'q', 'b', '2733', '9815', 'Z', '4053', '1391', '4603', '5773', '7025', '5289', 'n', '1623', '4519', 's', '9501', 'N', '7671']
Output (English): Z