#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ printf(char *, long long);
int scanf(char *, long long *, long long *);
int main() {
  long long m, n;
  while (scanf("%lld%lld", &m, &n) == 2) {
    printf("%lld\n", (n - m) >= 0 ? (n - m) : (m - n));
  }
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x20,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xeca(%rip),%rdi
lea    -0x10(%rbp),%rsi
lea    -0x18(%rbp),%rdx
call   1040 <scanf@plt>
cmp    $0x2,%eax
jne    1190 <main+0x70>
mov    -0x18(%rbp),%rax
sub    -0x10(%rbp),%rax
cmp    $0x0,%rax
jl     116f <main+0x4f>
mov    -0x18(%rbp),%rax
sub    -0x10(%rbp),%rax
mov    %rax,-0x20(%rbp)
jmp    117b <main+0x5b>
mov    -0x10(%rbp),%rax
sub    -0x18(%rbp),%rax
mov    %rax,-0x20(%rbp)
mov    -0x20(%rbp),%rsi
lea    0xe83(%rip),%rdi
call   1030 <printf@plt>
jmp    112f <main+0xf>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r12
push   %rbx
sub    $0x18,%rsp
lea    0xece(%rip),%rdi
lea    0x10(%rsp),%rsi
lea    0x8(%rsp),%rdx
call   1040 <scanf@plt>
cmp    $0x2,%eax
jne    118f <main+0x6f>
lea    0xebc(%rip),%r14
lea    0xeac(%rip),%r15
lea    0x10(%rsp),%r12
lea    0x8(%rsp),%rbx
xchg   %ax,%ax
mov    0x8(%rsp),%rax
sub    0x10(%rsp),%rax
mov    %rax,%rsi
neg    %rsi
cmovs  %rax,%rsi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
cmp    $0x2,%eax
je     1160 <main+0x40>
xor    %eax,%eax
add    $0x18,%rsp
pop    %rbx
pop    %r12
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [9 x i8] c"%lld%lld\00"
@.str.1 = [6 x i8] c"%lld\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i64
%3 = alloca i64
store i32 0, i32* %1
br label %4
4: ; preds = %20, %0
%5 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i64* %2, i64* %3)
%6 = icmp eq i32 %5, 2
br i1 %6, label %7, label %23
7: ; preds = %4
%8 = load i64, i64* %3
%9 = load i64, i64* %2
%10 = sub nsw i64 %8, %9
%11 = icmp sge i64 %10, 0
br i1 %11, label %12, label %16
12: ; preds = %7
%13 = load i64, i64* %3
%14 = load i64, i64* %2
%15 = sub nsw i64 %13, %14
br label %20
16: ; preds = %7
%17 = load i64, i64* %2
%18 = load i64, i64* %3
%19 = sub nsw i64 %17, %18
br label %20
20: ; preds = %16, %12
%21 = phi i64 [ %15, %12 ], [ %19, %16 ]
%22 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %21)
br label %4
23: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@.str = [9 x i8] c"%lld%lld\00"
@.str.1 = [6 x i8] c"%lld\0A\00"
define i32 @main() {
%1 = alloca i64
%2 = alloca i64
%3 = bitcast i64* %1 to i8*
%4 = bitcast i64* %2 to i8*
%5 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%6 = icmp eq i32 %5, 2
br i1 %6, label %7, label %15
7: ; preds = %0, %7
%8 = load i64, i64* %2
%9 = load i64, i64* %1
%10 = sub nsw i64 %8, %9
%11 = call i64 @llvm.abs.i64(i64 %10, i1 false)
%12 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %11)
%13 = call i32 @scanf(i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%14 = icmp eq i32 %13, 2
br i1 %14, label %7, label %15
15: ; preds = %7, %0
ret i32 0
}