#include<bits/stdc++.h>
using namespace std;
int main()
{
int i, idx = 0;
map<string, char> record;
char ch, str[200];
while(ch = getchar())
{
if(ch == EOF) break;
if(ch >= 'A' && ch <= 'Z')
ch = ch - 'A' + 'a';
if(ch >= 'a' && ch <= 'z')
{
str[idx++] = ch;
}
else
{
str[idx++] = '\0';
if(idx > 1)
{
record[str] = 1;
}
idx = 0;
}
}
for(map<string, char>::iterator i = record.begin(); i != record.end(); i++)
puts(i->first.c_str());
return 0;
}
using namespace std;
int main()
{
int i, idx = 0;
map<string, char> record;
char ch, str[200];
while(ch = getchar())
{
if(ch == EOF) break;
if(ch >= 'A' && ch <= 'Z')
ch = ch - 'A' + 'a';
if(ch >= 'a' && ch <= 'z')
{
str[idx++] = ch;
}
else
{
str[idx++] = '\0';
if(idx > 1)
{
record[str] = 1;
}
idx = 0;
}
}
for(map<string, char>::iterator i = record.begin(); i != record.end(); i++)
puts(i->first.c_str());
return 0;
}
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