#include  
#include  
using namespace std; 

Const int N=110; 

Int main () 
{
int n; 
Char vol [N]. 
While (the scanf (" % d ", & amp; N)==1 & amp; & n!=0) {
for(int i=0; iThe scanf (" % s ", vol); 
Int state=0, acnt=0, BCNT=0, CCNT=0, br=0;//read the state used to store state, 0 means that the unread to P, read to 1 P did not read T, read for 2 T 
for(int j=0; JIf (state==0) {
If (vol [j]=='P') {
State++; 
} 
Else if (vol [j]. {
='A')Printf (" \ n "); 
Br++; 
break; 
} 
The else acnt++; 
} 
Else if (state==1) {
If (vol [j]=='T') {
State++; 
} 
Else if (vol [j]. {
='A')Printf (" \ n "); 
break; 
} 
The else bcnt++; 
} 
Else if (state==2) {
If (vol [j]. {
='A')Printf (" \ n "); 
break; 
} 
The else ccnt++; 
} 
} 
if(! Br) {//first determines whether the interrupt 
If (CCNT==acnt * bcnt& & BCNT)//is in line with the conditions and A number of not less than 3 1 
Printf (" YES \ n "); 
The else printf (" \ n "); 
} 
} 
} 
//cout & lt; <"Hello world!" return 0;