! Try yukicoder
! author: Leonardone @ NEETSDKASU

PROGRAM yukicoder
    INTEGER(8) :: n, c, a(12), p
    CHARACTER(8) :: s
    
    DO c = 1, 12
        a(c) = 0
    END DO

    READ(*,*) n
    ! PRINT '(I0)', n
    
    c = 0
    DO WHILE (c < n)
        c = c + 1
        
        READ(*,*) s
        ! PRINT '(A)', s
        
        SELECT CASE (s)
            CASE ("ne")
                p = 1
            CASE ("ushi")
                p = 2
            CASE ("tora")
                p = 3
            CASE ("u")
                p = 4
            CASE ("tatsu")
                p = 5
            CASE ("mi")
                p = 6
            CASE ("uma")
                p = 7
            CASE ("hitsuji")
                p = 8
            CASE ("saru")
                p = 9
            CASE ("tori")
                p = 10
            CASE ("inu")
                p = 11
            CASE ("i")
                p = 12
        END SELECT
        a(p) = a(p) + 1
    END DO
    
    p = MAXVAL(a)
    ! PRINT '(I0)', p
    
    IF (n - p < p - 1) THEN
        PRINT '(A)', "NO"
    ELSE
        PRINT '(A)', "YES"
    END IF
    
    STOP
END PROGRAM yukicoder