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

int main(){
    int i, len, cnt_O = 0, cnt_X = 0, state;
    char str[101];

    scanf("%s", str);
    len = strlen(str);
    if(str[0] == 'O'){
        state = 0;
        cnt_O++;
    }else{
        state = 1;
        cnt_X++;
    }
    for(i = 1; i < len; i++){
        if(state == 0){
            if(str[i] == 'O'){
                cnt_O++;
            }else{
                cnt_O = 0;
                cnt_X++;
                state = 1;
                continue;
            }
        }
        if(state == 1){
            if(str[i] == 'X'){
                cnt_X++;
            }else{
                cnt_X = 0;
                cnt_O++;
                state = 0;
                continue;
            }
        }
        
        if(cnt_O == 3){
            state = 2;
            break;
        }
        if(cnt_X == 3){
            state = 3;
            break;
        }
    }
    if(state == 2){
        printf("East\n");
    }else if(state == 3){
        printf("West\n");
    }else{
        printf("NA\n");
    }

    return 0;
}