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Q1032.java
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Q1032.java
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package forRank;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
public class Q1032 {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
int N = Integer.parseInt(br.readLine());
String standard = br.readLine();
int stringLen = standard.length();
int histogram[] = new int[stringLen];
for (int i = 1; i < N; i++) {
String str = br.readLine();
for (int j = 0; j < stringLen; j++) {
if(str.charAt(j) == standard.charAt(j))
histogram[j]++;
}
}
for (int i = 0; i < stringLen; i++) {
if(histogram[i] + 1 == N)
bw.write(standard.charAt(i));
else
bw.write("?");
}
br.close();
bw.close();
}
}