Task: Program Execution
Input (English): 10, 11, ['8305', '3663', '9121', 'W', 't', 'x', '6739', 'z', '1853', 'z', 'x', '4287', '1781', 'L', 'U', '4101', 'E', '9793', 'l', 'X', 'F', 'K', '2983', '4189']
Output (English): xz