Task: Program Execution
Input (English): f, b, 335, i, 5369, m, W, X, 7701, 4371, U, W, N, P, 9127, n, n, k, l, 8787, b
Output (English): 1, 2, 4, 6, 7, 8, 11, 12, 13, 14, 16, 17, 18, 19, 21