Task: Program Execution
Input (English): 2409, p, 7623, 3313, 8507, o, 3247, t, f, 4875, k, 3549, 1183, 9653, 2181, d, f, f, 4019, x, 6045, x, 5581, 8329
Output (English): d, f, k, o, p, t, x