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package other;

import java.util.Scanner;

/**

* 把陀峰命名改为下划线命名

* 输入：

* SensorsData

*

* 输出：

* sensors_data

*/

public class ShenCe1 {

public static void main(String[] args){

Scanner scanner=new Scanner(System.in);

String str=scanner.nextLine();

String ret="";

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

char ch=str.charAt(i);

if((ch>='A'&&ch<='Z')){

char tmp=(char)((int)ch+32);

if(i==0){

ret+=tmp;

}else{

ret+="_"+tmp;

}

}else{

ret+=ch;

}

}

System.out.println(ret);

}

}