Task: Program Execution
Input (English): f, f, u, 4537, J, 3129, 1057, 4359, 3771, i, j, K, P, C, h, 4595, 3163, 7719, 8895, l, G, 6911, 47
Output (English): 4, 6, 7, 8, 9, 16, 17, 18, 19, 22, 23