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- #include<iostream>
- #include<cstring>
- using namespace std;
- void elimin(char s1[251],char s2[251],char s[251])
- {
- strcpy(s,"");
- int i,l=0;
- for(i='a'; i<='z'; i++)
- {
- if(strchr(s1,i)!=0 || strchr(s2,i)!=0)
- {
- s[l++]=i;
- }
- }
- }
- char rez[251],x[251],sir[251];
- int main()
- {
- int i,n;
- strcpy(sir,"");
- cin>>n;
- for(i=1; i<=n; i++)
- {
- cin>>x;
- elimin(x,sir,rez);
- strcpy(sir,rez);
- }
- cout<<rez;
- }
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