Anton and Letters

文章目录

一、Anton and Letters

总结

一、Anton and Letters

本题链接：Anton and Letters

题目：

A. Anton and Letters

time limit per test2 seconds

memory limit per test256 megabytes

inputstandard input

outputstandard output

Recently, Anton has found a set. The set consists of small English letters. Anton carefully wrote out all the letters from the set in one line, separated by a comma. He also added an opening curved bracket at the beginning of the line and a closing curved bracket at the end of the line.

Unfortunately, from time to time Anton would forget writing some letter and write it again. He asks you to count the total number of distinct letters in his set.

Input

The first and the single line contains the set of letters. The length of the line doesn’t exceed 1000. It is guaranteed that the line starts from an opening curved bracket and ends with a closing curved bracket. Between them, small English letters are listed, separated by a comma. Each comma is followed by a space.

Output

Print a single number — the number of distinct letters in Anton’s set.

Examples

input

{a, b, c}

output

3

input

{b, a, b, a}

output

2

input

{}

output

0

本博客给出本题截图：

题意：输入一个集合，去重后问集合内的元素个数

AC代码

#include <cstdio>
#include <set>
#include <iostream>
using namespace std;
set<int> s;
int main()
{
    char c;
    scanf("%c", &c);
    char a;
    while (cin >> a)
    {
        if (a == '}') break;
        if (a == ',' || a == ' ') continue;
        s.insert(a);
    }
    printf("%d\n", s.size());
    return 0;
}

总结

水题，不解释