#include <cstdio>
#include <cstdlib>
#include <ctime>
#include <cstring>

int sz[21] = { 0, 7, 8, 11, 25, 150, 250, 777, 1000, 1500, 2000 } ;
bool chk[1010];

int main()
{
    int st, ed, r = 1, c = 3;
    char in[110], out[110];
    scanf("%d%d", &st, &ed);
    srand(time(NULL));
    for(int i = st ; i <= ed ; i++ )
    {
        memset(chk, 0, sizeof(chk));
        sprintf(in, ".%d.in", i);
        freopen(in, "w", stdout);
        for(int j = 0 ; j < sz[i] ; j++ )
        {
            printf("%c", rand()%26+'a');
        }
        puts("");
        printf("%d", sz[i]-(rand()%sz[i]));
    }
}