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- #include <bits/stdc++.h>
- using namespace std;
- int main(){
- string s;
- cin >> s;
- string dummy="";
- dummy+=s;
- string dummy2="";
- for(int i=0;i<s.size();i++)
- {
- if(s[i]!='a')
- {
- dummy2+=s[i];
- }
- }
- string a="";
- string b="";
- for(int i=0;i<dummy2.size()/2;i++)
- {
- a+=s[i];
- }
- for(int i=dummy2.size()/2;i<dummy2.size();i++)
- {
- b+=s[i];
- }
- if(a==b)
- {
- size_t t=dummy.find(b);
- int x=b.size();
- if(t!=string::npos)
- {
- dummy.erase(t,x);
- }
- cout << dummy;
- }
- else
- {
- cout << ":(";
- }
- return 0;
- }
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