title: how to make this program only accept lowercase letter but in string
body: <p>How to make this program only accept lowercase letter . Im stuck here pls help</p>
  
  <p>C</p>
  
  <pre><code>char x[4] = "iss";
  char y[31];
  scanf("%30s", &amp; y);
  if (y &gt;= "A" &amp;&amp; y &lt;= "Z") {
  
    if ((strstr(x, y) == 0)) {
      printf("hiss");
    } else {
      printf("no hiss");
    }
  }
  </code></pre>