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SnakeProcession.java
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SnakeProcession.java
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import java.util.*;
class SnakeProcession
{
public static void main (String[] args) throws java.lang.Exception
{
// your code goes here
Scanner kb = new Scanner(System.in);
int t = kb.nextInt();
while(t>0){
t--;
int n = kb.nextInt();
String s = kb.next();
String str = "";
for(int i=0; i<n; i++){
if(s.charAt(i)!='.'){
str+=s.charAt(i);
}
}
int l = str.length();
if(str.charAt(0)=='T'){
System.out.println("Invalid");
}
else if(str.charAt(l-1)=='H'){
System.out.println("Invalid");
}
else{
int flag = 0;
for(int i=0; i<l-1; i++){
if(str.charAt(i)==str.charAt(i+1)){
flag++;
break;
}
}
if(flag==0)
System.out.println("Valid");
else
System.out.println("Invalid");
}
}
}
}