! yukicoder My Practice
! author: Leonardone @ NEETSDKASU

PROGRAM yukicoder
    INTEGER(8) :: n, i, f, j, t, ans
    CHARACTER(101) :: s
    
    READ(*,*) s
    
    n = LEN_TRIM(s)
    
    ! PRINT '(I0)', n
    
    ans = -1
    
    DO i = 1, n
        ! PRINT '(A)', s(i:i)
        
        IF (s(i:i) /= 'c') CYCLE
        
        f = 0
        DO j = i + 1, n
            IF (s(j:j) /= 'w') CYCLE
            f = f + 1
            IF (f < 2) CYCLE
            t = j - i + 1
            IF (ans < 0 .or. t < ans) THEN
                ans = t
            END IF
        END DO
        
    END DO
    
    PRINT '(I0)', ans
    
    STOP
END PROGRAM yukicoder