E = 0

W = 0

for i in input():
    
    if i == 'O':
        
        W = 0
        
        E += 1
        
        if E > 2:
            
            print('East')
            
            exit()
            
    elif i == 'X':
        
        E = 0
        
        W += 1
        
        if W > 2:
            
            print('West')
            
            exit()
            
print('NA')