Task: Program Execution
Input (English): f t 1395 4541 7107 4515 3129 3441 z 9741 d x m b v 4161 3531 h l w o n 3313 c z y 4539 3613 8979 d b n 4165 9215 6901 u 1479 3071 w 2349
Output (English): b, c, d, f, h, l, m, n, o, t, u, v, w, x, y, z