Task: Program Execution
Input (English): fNEBStxodkqXVgSXsJWLYxebgpCkSBf, kTjtwQTSdkqXVgSXsJWLYWUflsWPdZhWRE
Output (English): d, e, f, g, h, j, k, l, p, q, r, s, t, u, v, w, x, y, z