#include <iostream>
#include <cstring>
using namespace std;
 
const int MAX_LENGTH = 2000;
 
int main() {
	char a[MAX_LENGTH], b[MAX_LENGTH];
	cin >> a >> b;
//	cin.getline(a,MAX_LENGTH);
//	cin.getline(b,MAX_LENGTH);
	int lengthA = strlen(a);
	int lengthB = strlen(b);
	char *p ;
	int flag = 1, pos = -1;
	if (lengthA > lengthB) {
		 p = strstr(a, b); ///
		 while (p != 0 && flag == 1) {
			pos = p - a;
			cout << p - a;
			//p = strstr(p + 1, b);
			flag = 2;
		}
		cout << "DA ";
	} else if (lengthA < lengthB) {
		 p = strstr(b, a); ///
		  while (p != 0 && flag == 1) {
		  	pos = p - b;
		//	cout << p - b;
			p = strstr(p + 1, a);
			flag = 3;
		}
		cout << "NU " ;
	}
	cout << pos <<"<--\n";
 
	if (strcmp(a,b) == 0) {
		cout <<a << b;
	} else if (pos == -1){
		for (int i = 0; i < lengthA || i < lengthB  ; ++i) {
			if (i > lengthA - 1 && i < lengthB ) {
				cout << b[i];
			} else if (i > lengthB - 1 && i < lengthA ) {
				cout << a[i];
			} else {
				cout << a[i] << b[i];
				//	cout << a[i] << b[i]<< i <<";\n";
			}
		}
	} else if ( flag % 2 == 0) {
		cout << pos + 1 << " " << pos + lengthB ;
	} else {
		cout << pos << " " << pos + lengthA - 1;
	}
	return 0;
}

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