Task: Program Execution
Input (English): t s 1971 7165 c 4593 3729 2793 5665 5815 9655 u q r 4023 v z r z 8751 e k 9817 f i x j 4971 q h 2303 5747 6289 n x r 7957 2069 w 9431 l
Output (English): c, e, f, h, i, j, k, l, n, q, r, s, t, u, v, w, x, z