If language X solves 9 of my 10 problems, and language Y solves the last one of my problems, I can either, A: use language X and call out to language Y to solve

If language X solves 9 of my 10 problems, and language Y solves the last one of my problems, I can either, A: use language X and call out to language Y to solve all my 10 problems. Or, B: use just language Y to solve 1 of my 10 problems. You suggest alternative B?