try:
    m,n=map(int,input().split())
    if m<=0 or n<=0:
        print("Invalid input")
    else:
        matrix1=[]
        matrix2=[]
        for _ in range(m):
            row=list(map(int,input().split()))
            matrix1.append(row)
        for _ in range(m):
            row=list(map(int,input().split()))
            matrix2.append(row)
        if len(matrix1)!=len(matrix2) or len(matrix1[0])!=len(matrix2[0]):
            print("Invalid input")
        else:
            result=[[matrix1[i][j]+matrix2[i][j] for j in range(n)] for i in range(m)]
            for row in result:
                print(*row)
except ValueError:
    print("Invalid input")