Task: Program Execution
Input (English): 7489, Z, 5509, 9029, 2903, X, g, 6997, 2305, N, 4855, w, I, U, 5255, 6521, 4673, 8615, n, f, 2285, r
Output (English): Z, X, g, N, w, I, U, n, f, r, 7489, 5509, 9029, 2903, 6997, 2305, 4855, 5255, 6521, 4673, 8615, 2285