package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
func main() {
scanner := bufio.NewScanner(os.Stdin)
for true {
scanner.Scan()
line := scanner.Text()
part := strings.Split(line, " ")
a, _ := strconv.Atoi(part[0])
b, _ := strconv.Atoi(part[1])
if a == 0 && b == 0 {
break
}
fmt.Println(a + b)
}
}



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