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DS-1000 / 176 / I have this Pandas dataframe (df):

Problem

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Problem:
I have this Pandas dataframe (df):
     A    B
0    1    green
1    2    red
2    s    blue
3    3    yellow
4    b    black


A type is object.
I'd select the record where A value are string to have:
   A      B
2  s   blue
4  b  black


Thanks


A:
<code>
import pandas as pd


df = pd.DataFrame({'A': [1, 2, 's', 3, 'b'],
                   'B': ['green', 'red', 'blue', 'yellow', 'black']})
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

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Source and history

upstream_id / Original problem ID: 176
task_id: a4086ce1-dd9c-544d-b228-f1ec7a687f31
task_key: default--test--176
task_revision_id: 2
config / split: default / test

Official source

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