How to filter out letters from text file (start of string and end) , then print them out

The function needs to skip the lines in text file (after reading it) with contains symbol or numbers in FIRST &amp;&amp; LAST string position. For example string($password column)&nbsp;<strong>1</strong>21dafas<strong>d</strong>&nbsp;should be skipped AND not printed out, because it starts with number I have tried many things, but all trials failed. Im new to PHP language

The function needs to skip the lines in text file (after reading it) with contains symbol or numbers in FIRST && LAST string position. For example string($password column) 121dafasd should be skipped AND not printed out, because it starts with number I have tried many things, but all trials failed. Im new to PHP language

THE CODE
 function dataPrint(){

print "\t"." Users: Login Password <br>";
$file=fopen("data.txt" , "c");
if (!$file)
print "Error! No such file!";

else {
print "<table><tr><th width="50%">Login</th>
<th width="50%">Password</th>
";
$info=file("data.txt");
foreach($info as $rec)
{

             $rec=rtrim($rec);

             print("&lt;tr&gt;");
             list($login, $pass) = explode(' ', "$rec");
             print("&lt;td&gt;$login&lt;/td&gt;");
             print("&lt;td&gt;$pass&lt;/td&gt;");

     }

print("</table>");

Right now it prints all data as table

Login   Password
quartz 2sp1lzod54at3sia6
quartz1 73u168rtz54a2q
quartz2 [email protected]

But it should print only those lines with contains only letters in start && end of string

Example :
Login Password
quartz1 [email protected] <----- NOT VALID(Should not be printed)
quartz2 asdf!2adf1 <----- NOT VALID(Should not be printed)
quartz3 [email protected] <----- VALID
quartz4 gsasdff11e <----- VALID
quartz5 [email protected]!adf1d <----- VALID

The end should look like this..

Login     Password
quartz3 [email protected]
quartz4 gsasdff11e
quartz5 [email protected]!adf1d


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Description
In this course you will be introduced with some tricky questions that everyone face during their interview. In each solutions I have included some useful functions which we generally use at the time of development also. I have covered the following area in my course with Questions, Attractive Presentations and Practical Solutions that will help you to understand the logic behind PHP in a different way.

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Basic knowledge
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