Task: Program Execution
Input (English): x 5137 7683 p k 1981 435 3141 z t 73 1401 g g 9151 B 5853 s 3481 u C 9973 3235 M e 1947 Y z 5175 H v f
Output (English): 2, 3, 6, 7, 8, 11, 12, 15, 17, 19, 22, 23, 26, 29