View Code of Problem 22

#include<bits/stdc++.h>
using namespace std;

int main(void)
{
  int i;
  vector <int> alpha1(26,0),alpha2(26,0);
  string s1,s2;
  while(cin>>s1>>s2)
  {
    for(i=0;i<s1.size();++i)
      alpha1[s1[i]-'a']=1;
    for(i=0;i<s2.size();++i)
      alpha2[s2[i]-'a']=1;
    for(i=0;i<26;++i)
      if(alpha1[i]==1&&alpha2[i]==1)
        printf("%c",'a'+i);
    cout<<endl;
    alpha1.clear();
    alpha2.clear();
  }
}