import java.util.Arrays;
 
public class Main {
	public static void main(String[] args) {
		String[][] inputs = {
			{"floor", "break"},
			{"wood", "book"},
			{"a fall to the floor", "braking the door in"}
		};
 
		Arrays.stream(inputs)
			  .forEach(cur -> {
			  	for(int i = 0; i < cur[0].length(); i++) {
			  		if(cur[0].charAt(i) != cur[1].charAt(i)) {
			  			System.out.println(cur[0]);
			  			cur[0] = new StringBuilder(cur[0])
			  					.replace(i, i + 1, Character.toString(cur[1].charAt(i)))
			  					.toString();
			  		}
			  	}
 
			  	System.out.println(cur[0] + "\n");
			  });
	}
}

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