Task: Program Execution
Input (English): 1, 6, ['9637', '4089', 'y', 'x', '6891', '2661', '9295', 't', '2117', '8445', '3119', 'f', '9131', 'S', 'B', '3159', '6491', 'z', 'M']
Output (English): 9637, 9295, 9131, M