Task: Program Execution
Input (English): 8537 f D 2743 s l m 4671 2181 E 7679 n b s 853 6783 7541 9343 y 2155 s U 3275 8393 z 7927
Output (English): 1, 4, 8, 9, 11, 15, 16, 17, 18, 20, 23, 24, 26