Task: Program Execution
Input (English): 4351, c, j, 2751, 8519, 2145, 8607, X, P, 3525, 1489, l, 2789, 1009, 7635, o, K, F, d, x, 8623
Output (English): 1, 4, 5, 6, 7, 10, 11, 13, 14, 15, 21