>>419
#include <iostream>

int
main()
{
    char str[] = "ABCDE";

    for( int i = 0; i < 5; ++i )
    {
        for( int j = 0; j <= i; ++j )
        {
            std::cout << str[ j ];
        }
        std::cout << std::endl;
    }

    return 0;
}