Task: Program Execution
Input (English): 9209, 575, 6527, o, c, x, 2499, r, s, 8549, q, 8535, 4691, q, 8849, g, i, 1203, 463, z, 1621, 9099, h, 9741
Output (English): c, g, h, i, o, q, r, s, x, z