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

int main(void){
    char s[101];
    scanf("%s", s);

    char east[4] = "OOO";
    char west[4] = "XXX";

    int s_len = strlen(s);
    int ans = 0;
    if(s_len < 3){
        ans = 0;
    }

    char* ps = s;
    // printf("ループ前ps:%s\n", ps);
    for(int i=0; i<=s_len-3; i++){
        if(strncmp(ps, east, 3)==0){
            ans = 1;
            break;
        }
        if(strncmp(ps, west, 3)==0){
            ans = -1;
            break;
        }
        ps += 1;
        // printf("ループ中i:%d, ps:%s\n", i, ps);
    }

    if(ans==0){
        printf("NA\n");
    }else if(ans==1){
        printf("East\n");
    }else{
        printf("West\n");
    }

    return 0;
}