Reference Error

i have this code,


CREATE TABLE s
(sno VARCHAR(5) NOT NULL PRIMARY KEY,
name VARCHAR(16),
city VARCHAR(16)
)

CREATE TABLE p
(pno VARCHAR(5) NOT NULL PRIMARY KEY,
descr VARCHAR(16),
color VARCHAR(8)
)

CREATE TABLE sp
(sno VARCHAR(5) NOT NULL REFERENCES s,
pno VARCHAR(5) NOT NULL REFERENCES p,
qty INT CHECK (qty>=0),
PRIMARY KEY (sno, pno)
)


when i run this query i get an error saying:

Column 's.sno' is not the same length as referencing column 'sp.sno' in foreign key 'FK__sp__sno__5EBF139D'. Columns participating in a foreign key relationship must be defined with the same length.


can anyone assist me what to be done?