Mediumstringshash
First Non-Repeating Character
Time limit 2 s · Memory 64 MBAcceptance: —Solved by: 0
Statement
You are given a string of lowercase Latin letters. Print the first character that occurs in the string exactly once. If there is no such character, print -1.
Examples
Example 1
Input
aabcc
Output
b
Example 2
Input
aabb
Output
-1
Constraints
- String length is between 1 and 10^5