process.stdin.resume();
process.stdin.setEncoding('utf8');
 
var a = [[0, 47], [50, 51], [53, 53], [55, 55], [58, 97], [101, 101], [103, 1114111]];
var b = [[48, 57], [97, 102]];
 
var output = [];
 
for (var i = 0; i < a.length; ++i) {
	for (var j = 0; j < b.length; ++j) {
		var intersection = [
			Math.max(a[i][0], b[j][0]),
			Math.min(a[i][1], b[j][1]),
		];
 
		if (intersection[0] <= intersection[1]) {
			output.push(intersection)
		}
	}
}
 
console.log(output);

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