#include <stdio.h>

int main()
{
    char c;
    int q = 1;
    while((c = getchar()) != EOF)
    {
        if('"' == c)
        {
            printf("%s", q ? "``" : "''");
            q = !q;
        }
        else
            printf("%c", c);
    }
    return 0;
}