How we can focus cursor pointer automatically in begining input feild after click mat select dropdown in angular

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this is my code

<mat-form-field appearance="fill" class="col-md-3" required>
            <mat-label>Category</mat-label>
            <mat-select
              formControlName="category"
              #ddlCategory
              (closed)="resetCategories(); categorySearch.value = ''"
              [(ngModel)]="DBsome"
            >
              <input
              #input
                class="dropdown-searchbox"
                #categorySearch
                matInput
                (keyup)="
                  $event.stopPropagation();
                  categorySearchFilter($event.target.value)
                "
                oninput="this.value = this.value.toUpperCase()"
                (keydown)="handleInput($event)"
                placeholder="Search"
                [matAutocomplete]="auto"
              />
               
            </mat-select>
          </mat-form-field>

I want to cursor pointer beginning cursor pointer will automatically focus on input field after clicking dropdown