Task: Program Execution
Input (English): 1, 6, ['r', 'l', '253', 's', 'U', '5171', 'c', '8215', '8849', 'b', 'E', '9185', 'Y', '8209', 'S', 'U', 'h', 'D', 'X', '5205', 'F']
Output (English): r, c, Y, X