Task: Program Execution
Input (English): 7415, p, 841, k, f, l, 2591, 7323, 4709, 8037, x, P, 4637, i, 2291, h, 2973, g, t, 2835
Output (English): 1, 3, 7, 8, 9, 10, 13, 15, 17, 20