can someone help me to solve this?

    task
123454321
123454321
123454321
123454321
123454321





    #include<iostream>
    using namespace std;
    int main(){
    int i,j;
    for (i=1; i<=5; i++)
    cout<<i;
    for(j=4; j>=1; j--)
    cout<<j;
    }

But what the next ???