Task: Program Execution
Input (English): 7509, 3065, 7845, 6693, P, g, 789, 1055, 9001, 7201, 4381, 2601, 2579, a, z, 8701, n, 7025, b, 2303, 4661, s, V
Output (English): 1, 2, 3, 4, 7, 8, 9, 10, 11, 12, 13, 16, 18, 20, 21