#CSPJ2019A. 数字游戏 (Number Games)

数字游戏 (Number Games)

Description

Little K sent a binary string of length 88 to Little P to play a number game. Little P wants to know how many times the character 11 occurs in the string.

Note: A binary string is a string in which each character is either 00 or 11. E.g., "101" (withuot quotes) is a binary string of length 33.

Input Format

The input has only one line consisting of a binary string ss of length 88.

Output Format

Print the number of times the character 11 occurs in ss.

00010100
2

Constraints

For 20%20\% of the data, all characters in the string are 00s.
For 100%100\% of the data, the input may contain both 00s and 11s. The length of the string is 88.