```go
package main

import (
	"fmt"
	"sort"
)

type skill struct {
	name  string
	level int
}

func main() {
	var n, m int
	var k float64
	fmt.Scan(&n, &m, &k)

	skills := make(map[string]int)

	for i := 0; i < n; i++ {
		var name string
		var exp int
		fmt.Scan(&name, &exp)
		
		newExp := int(float64(exp)*k + 1e-9)
		
		if newExp >= 100 {
			skills[name] = newExp
		}
	}

	for i := 0; i < m; i++ {
		var name string
		fmt.Scan(&name)
		if _, exists := skills[name]; !exists {
			skills[name] = 0
		}
	}

	var result []skill
	for name, level := range skills {
		result = append(result, skill{name, level})
	}

	sort.Slice(result, func(i, j int) bool {
		return result[i].name < result[j].name
	})

	fmt.Println(len(result))
	for _, s := range result {
		fmt.Printf("%s %d\n", s.name, s.level)
	}
}
```