#include <iostream>
#include <cassert>

int main()
{
    constexpr int N = 5 ;
    constexpr int a[N] = { 1, 2, 3, 4, 5 } ;
    constexpr int b[N] = { 2, 9, 8, 0, 7 } ;

    const auto isdigit = [] ( int v ) { return v >= 0 && v < 10 ; } ;
    int sum = 0 ;
    for( int i = 0 ; i < N ; ++i )
    {
        assert( isdigit( a[i] ) && isdigit( b[i] ) ) ;
        sum *= 10 ;
        sum += a[i] + b[i] ;
    }
    std::cout << sum << '\n' ;
}