#include<bits/stdc++.h> using namespace std; int main() { string s; cin>>s; int len=s.length(); for(int i=0;i<len;i++){ if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')){ cout<<s[i]; } } return 0; }
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