class Main {
private static void reverseWord(char c[], int a, int b) {
for(int i=0; i<=(b-a)/2; i++) {
char ch = c[a+i];
c[a+i] = c[b-i];
c[b-i] = ch;
}
}
public static String reverseString(String str) {
char s[] = str.toCharArray();
reverseWord(s,0,s.length-1);
int j = 0;
for(int i=0; i<s.length; i++) {
if(s[i] == ' ') {
reverseWord(s,j, i-1);
j = i+1;
}
}
reverseWord(s, j, s.length-1);
return new String(s);
}
public static void main(String[] args) {
String str = "this is santhosh";
System.out.println(reverseString(str));
}
}
