Q88

Consider the following grammar G: $S \rightarrow bS \mid aA \mid b$ $A \rightarrow bA \mid aB$ $B \rightarrow bB \mid aS \mid a$ Let $N_a(w)$ and $N_b(w)$ denote the number of a’s and b’s in a string $\omega$ respectively. The language $L(G)$ over $\left\{a, b\right\}^+$ generated by $G$ is