#include <stdio.h>
#include <string.h>

int main(){
    char S[100];
    int i;
    char ef, wf;
    
    ef = wf = 0;
    scanf("%s", S);
    
    for(i = 0; i < strlen(S); i++){
        if(!strncmp("OOO", &S[i], 3)){
            ef = 1;
            break;
        }else if(!strncmp("XXX", &S[i], 3)){
            wf = 1;
            break;
        }
    }
    
    if(ef){
        printf("East\n");
    }else if(wf){
        printf("West\n");
    }else {
        printf("NA\n");
    }
    
    return 0;
}