Get first letter of a string from column : <p>I'm fighting with pandas and for now I'm loosing. I have source table similar to this:</p>

<pre><code>import pandas as pd

a=pd.Series([123,22,32,453,45,453,56])
b=pd.Series([234,4353,355,453,345,453,56])
df=pd.concat([a, b], axis=1)
df.columns=['First', 'Second']
</code></pre>

<p>I would like to add new column to this data frame with first digit from values in column 'First':
a) change number to string from column 'First'
b) extracting first character from newly created string
c) Results from b save as new column in data frame</p>

<p>I don't know how to apply this to the pandas data frame object. I would be grateful for helping me with that.</p>
