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a year ago
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#include <stdio.h>
int main()
{
    long long int l1,r1,l2,r2;
    scanf("%lld %lld %lld %lld",&l1,&r1,&l2,&r2); ///taking the values
    if ((r1-l2)>=0)
    {
        if (r2>r1)
        {
            printf("%lld %lld",l2,r1);
        }
        else if(r2<r1)
        {
            printf("%lld %lld",l2,r2);  
        }
        else if (r1==r2 && l1>l2)
        {
            printf("%lld %lld",l1,r1);
        }
        else if (r1==r2 && l1<l2 && r1==l2)
        {
            printf("%lld %lld",r1,l2);
        }
        else if (r1==r2 && l1<l2 && r1!=l2)
        {
            printf("%lld %lld",l2,r2);
        }
        
        
        else
        {
            printf("%lld %lld",l1,r1);
        }
        
    }
    
    else if((r1-l2)<0)
    {
        printf("-1");
    }
    
    
    return 0;
}