Task: Program Execution
Input (English): 7921, 4657, 159, 221, 1777, m, 6757, x, 8747, 2517, n, x, n, q, 49, 9969, 8347, c, 3725, 9347, g, f, 1827, 3015
Output (English): c, f, g, m, n, q, x