I have 100s of enormous text files in the form of 

```
p 127210 3240293 23423234 3242323423
3242323 23423423 23423234 32423423 

```

which I want to turn to 

```
127210 3240293 23423234 3242323423
3242323 23423423 23423234 32423423

```

I've tried using

```
sed '1 s/^.//' input > output 

```

but that gives me

```
 127210 3240293 23423234 3242323423
3242323 23423423 23423234 32423423

```

i.e. an annoying space where the p was. Can anyone help me modify the sed expression to get the output without the space?

Thanks