Background

Description

输入1行字符，统计出其字母字符的个数，并输出。

Format

Input

Output

Samples

aadsfi3rfqewf902fvad09u0109u0aifaspdfajdsf0a9asdf0102390p800-0-13adsf089130909708

41

jjaldfj112e09i0adf80a8fadfjadsfl0980pijlul8080120padsf;alsdf0-apds9f-adsfasdf

52

aadsfljasdfluoadjfladsfjaldsfja;dsfjasdf

39

Limitation

1s, 1024KiB for each test case.