Cannot convert LEFT function from redshift to presto/trino

[pangyifish]

sql = """
select LEFT(a, 2) from (select '12345' as a)

"""

converted_sql = sqlglot.transpile(sql, read="redshift", write="trino")[0]
print(converted_sql)

output

SELECT LEFT(a, 2) FROM (SELECT '12345' AS a)

trino will throw error: mismatched input 'LEFT'. Expecting: '*', 'ALL', 'DISTINCT', <expression>" when executing the output SQL
https://docs.aws.amazon.com/redshift/latest/dg/r_LEFT.html