Types: N: int, s: List[str], t: List[int], X: str  
Ranges: 1 ≤ N ≤ 50, 1 ≤ len(s_i) ≤ 100, 1 ≤ len(X) ≤ 100, 1 ≤ t_i ≤ 1000  
Addtl Info: s_i and X consist of lowercase English letters, s_1, ..., s_N are distinct, there exists an integer i such that s_i = X