7.
#include <iostream>
using namespace std;
int suma(int n)
{
int s=0;
while(n>0)
{s=s+n%10;
n=n/10;
}
return s;
}
int main()
{
int n,v[100],i,j;
cin>>n;
for(i=1;i<=n;i++)
cin>>v[i];
for(i=1;i<n;i++){int s1=suma(v[i]);
for(j=i+1;j<=n;j++){int s2=suma(v[j]);
if(s1==s2) cout<<"("<<v[i]<<","<<v[j]<<")"<<" ";}}
return 0;
}
