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import java.io.*;

import java.util.*;

public class EquidistantString {

public static void main(String[] args) throws IOException {

BufferedReader f = new BufferedReader(new InputStreamReader(System.in));

String s = f.readLine();

String t = f.readLine();

int xCount = 0;

for (int i = 0; i < s.length(); i++) {

if (s.charAt(i) != t.charAt(i))

xCount++;

}

if (xCount % 2 == 1)

System.out.println("impossible");

else {

boolean tookS = false;

boolean changed = false;

StringBuilder result = new StringBuilder();

for (int i = 0; i < s.length(); i++) {

if (s.charAt(i) == t.charAt(i))

result.append("0");

else {

if (tookS)

result.append(t.charAt(i));

else

result.append(s.charAt(i));

tookS = !tookS;

}

}

System.out.println(result);

}

}

}