int main(){
	int n,i,a[50000],b[50000],min,max;
	double j;
	scanf("%d",&n);
	for(i=0;i<n;i++){
		scanf("%d%d",&a[i],&b[i]);}
	min=a[0];max=b[0];
	for(i=1;i<n;i++){
		if(a[i]<min){
			min=a[i];}
		if(b[i]>max){
			max=b[i];}}
	for(j=1.0*min+0.1;j<=max;j++){
		for(i=0;i<n;i++){
			if(j<a[i]||j>b[i]){continue;}
			else{break;}}
		if(i==n){
			printf("no");
			return 0;}
	}
	printf("%d %d",min,max);
	return 0;
}