#include<stdio.h>
#include<stdlib.h>
main(){
    char S[101];
    scanf("%s",S);
    int n = 0;
    for(int i = 0;S[i] != '\0';i++){
        int flag = S[i]=='O'?1:-1;
        if(!n){n += flag;}
        else if(abs(n)>2){break;}
        else{
            if(n*flag>0){n += flag;}
            else{n=flag;}
        }
    }
    n /= 3;
    printf("%s\n",n?n>0?"East":"West":"NA");
}