# include <bits/stdc++.h>
using namespace std;
int main()
{
    long long s[]={6,2,5,5,4,5,5,3,7,6};
    long long n,a,b,c,d,k=0;
    cin>>n;
    if(n<8 && n>26)
    {cout<<"Impossible"<<endl;
    return 0;}
    for(a=0; a<=2; a++){
        for(b=0; b<=9; b++){
            for(c=0; c<=5; c++){
                for(d=0;d<=9;d++){
                    if(!(a==2 && b>3))
                    {if((s[a]+s[b]+s[c]+s[d])==n){
                        k++;
                        cout<<a<<b<<":"<<c<<d<<endl;
                        return 0;}}}}}}
                        cout<<"Impossible"<<endl;
                        return 0;}