Task: Program Execution
Input (English): 1, ['a', '1377', '4245', 'u', 'b', '6401', '7989', 'S', '4021', '7821', '2903', 'E', 'O', '3361', 'u', '1167', 'b', 'N', '5945', 'R', 'u', '4455', 'V', 'M']
Output (English): a