View Compilation Error

0_0_39790437_12934\Main.java:1: 错误: 需要'.'
import sys
          ^
0_0_39790437_12934\Main.java:3: 错误: 需要';'
while True:
     ^
0_0_39790437_12934\Main.java:3: 错误: 需要class, interface或enum
while True:
          ^
0_0_39790437_12934\Main.java:4: 错误: 需要class, interface或enum
    n,m = map(int, sys.stdin.readline().split())
    ^
4 个错误