Problem Description

Student K sent Student P a 01 string of length $8$ to play a number game. Student P wants to know how many $1$’s are in the string.

Note: A 01 string is a string where every character is $0$ or $1$. For example, 101 is a 01 string of length $3$.

Input Format

The input file contains only one line: a 01 string $s$ of length $8$.

Output Format

The output file contains only one line containing an integer, which is the number of character $\mathbf 1$ in the 01 string.

00010100

2

11111111

8

Hint

Sample 1 Explanation

There are $2$ characters $1$ in this 01 string.

Sample 2 Explanation

There are $8$ characters $1$ in this 01 string.

Constraints

• For $20\%$ of the testdata, all input characters are guaranteed to be $0$.
• For $100\%$ of the testdata, the input can only contain character $0$ and character $1$, and the string length is fixed at $8$.

Translated by ChatGPT 5