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import java.io.BufferedReader;
import java.io.InputStreamReader;
public class Main {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
String input = reader.readLine();
double number = Double.parseDouble(input);
System.out.println(input + ":" + Math.sqrt(number));
reader.close();
}
}
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