California-style Grilled-Chicken Rolls

(10-inch) flour tortillas

mayonnaise

medium leaves Boston lettuce

boneless grilled chicken, cut into thin, long strips (about 3 cups)

small cucumber, seeded, peeled and coarsely shredded

carrots, peeled and coarsely shredded

ripe avocado, peeled, pitted and cut into 1/2-inch slices

kosher salt

Freshly ground pepper,