Task: Program Execution
Input (English): 4621, t, I, 6655, b, 5621, u, 1387, s, 1227, 4913, 4891, 9491, A, f, K, U, n, u, E
Output (English): 2, 3, 5, 7, 9, 14, 15, 16, 17, 18, 19, 20