int A, B, C;

//cout<<"Digite las tres temperaturas del primer, segundo y tercer dia (numeros enteros)";
cin>>A>>B>>C;

if (B<A and B=C){
    cout<<":)";

};

if (A<B and C<B){
    cout<<":(";     
};

if (A<B and B<C and (C-B)<(B-A)){
    cout<<":(";

};

if (A<B and B<C and (C-B)>=(B-A)){
    cout<<":)";

};

if (B<A and C<B and (B-C)<(A-B)){
    cout<<":)";     
};

if (B<A and C<B and (B-C)>=(A-B)){
    cout<<":(";

};

if (A==B and C>B){
    cout<<":)";

};

if (A==B and C<=B){
    cout<<":(";

};

cout<<endl;