100. Longest Common Prefix
EasyString
Print the longest common prefix of n words, or - if it is empty.
Input format
Line 1: n Next n lines: one word each
Output format
The common prefix, or -
Example 1
Input
3 flower flow flight
Output
fl
Example 2
Input
3 dog racecar car
Output
-
Constraints
1 ≤ n ≤ 1000
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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