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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int tt; cin>>tt; for(int cs=1;cs<=tt;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);
- cout.tie(0);
- string a,b;
- set<string>x;
- ll i,j,k,l=0;
- while(cin>>a)
- {
- b.clear();
- b="";
- for(i=0; i<a.size(); i++)
- {
- char c=tolower(a[i]);
- if(c>='a' && c<='z')
- {
- b+=c;
- }
- else if(b!="")
- {
- x.insert(b);
- b.clear();
- b="";
- }
- }
- if(b!="")
- {
- x.insert(b);
- }
- }
- for(auto d:x)
- {
- cout<<d<<endl;
- }
- return 0;
- }
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