Simple string manipulation (string)
Description
Give you a string with a length of and only lowercase letters (subscripts start from to ), perform the following two operations times:
1 i c
: Replace the character at position in the string with the character ;
2 l r
: The number of different characters from the th position to the th position in the query string .
Format
Input
The first line contains an integer , which represents the length of the string .
The second line contains a string of length , containing only lowercase letters.
The third line contains an integer , which represents the number of operations.
In line , each line describes one of the above two operations.
Output
For each operation , the output line contains an integer, which represents the number of different characters in .
Sample
Input
7
abcdbbd
6
2 3 6
1 5 z
2 1 1
1 4 a
1 7 d
2 1 7
Output
3
1
5
Hint
:;
:。
Sample Code
Code is not available!
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