Task: Program Execution
Input (English): 7021, 7963, t, 6301, M, W, 8463, 6807, 679, 2467, N, l, 5085, X, a, X, O, 51, Y, 3145, z, 5903
Output (English): 3, 5, 6, 11, 12, 14, 15, 16, 17, 19, 21