/* package whatever; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
{
Pattern pattern = Pattern.compile("^(?:0|63)?\\d{10}\\b");
Matcher m = pattern.matcher(input);
if (m.find()) {
System.
out.
println(m.
group()); }
}
}
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