You have to count the distinct alphabet from a sentence.

Example: "I am a programmer" , there are  8 distinct alphabet.They are 'I','a','m','p','r','o','g','e'.

Input

Each line will contain a string, 'S' with space which will not exceeded 1000 characters.

Output

You have to count the distinct alphabet of each line.

Example

Input:
aabbcc

aa bb cc

abcd efgh xyj 123

Output:
3

3

11