Task: Program Execution
Input (English): 1447, q, 9529, 2971, s, 7351, 6753, 3493, v, c, x, 3097, 9145, b, e, b, 2967, 6933, e, s, v, f, z, r
Output (English): b, c, e, f, q, r, s, v, x, z