443A

 

Problem Link

<Source Code>

#include<bits/stdc++.h>

using namespace std;

#include<set>
int main()
{
string str;
getline(cin,str);
set<char> letter;
for(int i=1;i<str.size();i++)
{
if('a'<=str[i] &&str[i]<='z')
letter.insert(str[i]);
}
cout<<letter.size()<<endl;

}
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About waprogramming

I am in CSE,from CUET
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