Răspuns :
#include <bits/stdc++.h>
using namespace std;
int i, n, v[150];
char s[256];
int main()
{
cin.getline(s, sizeof(s));
n = strlen(s);
for(i = 0; i < n; i ++)
if(s[i] >= 'a' && s[i] <= 'z') v[s[i]] = 1;
for(i = 0; i < n; i ++)
if(v[s[i]] == 1)
{
cout << s[i] << " ";
v[s[i]] = 0;
}
return 0;
}
using namespace std;
int i, n, v[150];
char s[256];
int main()
{
cin.getline(s, sizeof(s));
n = strlen(s);
for(i = 0; i < n; i ++)
if(s[i] >= 'a' && s[i] <= 'z') v[s[i]] = 1;
for(i = 0; i < n; i ++)
if(v[s[i]] == 1)
{
cout << s[i] << " ";
v[s[i]] = 0;
}
return 0;
}