#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 */
scalar_t__ EOF;
int /*<<< orphan*/ printf(char *, unsigned long long);
scalar_t__ scanf(char *, unsigned long long *, unsigned long long *);
int main() {
  unsigned long long int X, Y;
  while (scanf(" %llu %llu", &X, &Y) != EOF) {
    if (X >= Y)
      printf("%llu\n", X - Y);
    else if (Y > X)
      printf("%llu\n", Y - X);
  }
  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>
mov    0x2e9e(%rip),%rcx
cmp    (%rcx),%rax
je     11a6 <main+0x86>
mov    -0x10(%rbp),%rax
cmp    -0x18(%rbp),%rax
jb     117a <main+0x5a>
mov    -0x10(%rbp),%rsi
sub    -0x18(%rbp),%rsi
lea    0xe9b(%rip),%rdi
call   1030 <printf@plt>
jmp    11a1 <main+0x81>
mov    -0x18(%rbp),%rax
cmp    -0x10(%rbp),%rax
jbe    119c <main+0x7c>
mov    -0x18(%rbp),%rsi
sub    -0x10(%rbp),%rsi
lea    0xe74(%rip),%rdi
call   1030 <printf@plt>
jmp    11a1 <main+0x81>
jmp    112f <main+0xf>
xor    %eax,%eax
add    $0x20,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
sub    $0x10,%rsp
lea    0xecc(%rip),%rdi
lea    0x8(%rsp),%rsi
mov    %rsp,%rdx
call   1040 <scanf@plt>
mov    0x2ea0(%rip),%r13
cmp    0x0(%r13),%rax
je     11a5 <main+0x85>
lea    0xeb6(%rip),%r14
lea    0xea4(%rip),%r15
lea    0x8(%rsp),%r12
mov    %rsp,%rbx
cs nopw 0x0(%rax,%rax,1)
xchg   %ax,%ax
mov    0x8(%rsp),%rsi
mov    (%rsp),%rax
mov    %rsi,%rcx
sub    %rax,%rcx
neg    %rcx
sub    %rax,%rsi
cmovb  %rcx,%rsi
mov    %r14,%rdi
call   1030 <printf@plt>
mov    %r15,%rdi
mov    %r12,%rsi
mov    %rbx,%rdx
call   1040 <scanf@plt>
cmp    0x0(%r13),%rax
jne    1170 <main+0x50>
xor    %eax,%eax
add    $0x10,%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
ret

LLVM IR (-O0):
@.str = [11 x i8] c" %llu %llu\00"
@EOF = global i64 0
@.str.1 = [6 x i8] c"%llu\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i64
%3 = alloca i64
store i32 0, i32* %1
br label %4
4: ; preds = %27, %0
%5 = call i64 @scanf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i64* %2, i64* %3)
%6 = load i64, i64* @EOF
%7 = icmp ne i64 %5, %6
br i1 %7, label %8, label %28
8: ; preds = %4
%9 = load i64, i64* %2
%10 = load i64, i64* %3
%11 = icmp uge i64 %9, %10
br i1 %11, label %12, label %17
12: ; preds = %8
%13 = load i64, i64* %2
%14 = load i64, i64* %3
%15 = sub i64 %13, %14
%16 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %15)
br label %27
17: ; preds = %8
%18 = load i64, i64* %3
%19 = load i64, i64* %2
%20 = icmp ugt i64 %18, %19
br i1 %20, label %21, label %26
21: ; preds = %17
%22 = load i64, i64* %3
%23 = load i64, i64* %2
%24 = sub i64 %22, %23
%25 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %24)
br label %26
26: ; preds = %21, %17
br label %27
27: ; preds = %26, %12
br label %4
28: ; preds = %4
ret i32 0
}

LLVM IR (-O2):
@.str = [11 x i8] c" %llu %llu\00"
@EOF = global i64 0
@.str.1 = [6 x i8] c"%llu\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 i64 @scanf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%6 = load i64, i64* @EOF
%7 = icmp eq i64 %5, %6
br i1 %7, label %19, label %8
8: ; preds = %0, %8
%9 = load i64, i64* %1
%10 = load i64, i64* %2
%11 = icmp ult i64 %9, %10
%12 = sub i64 %10, %9
%13 = sub i64 %9, %10
%14 = select i1 %11, i64 %12, i64 %13
%15 = call i32 @printf(i8* getelementptr inbounds ([6 x i8], [6 x i8]* @.str.1, i64 0, i64 0), i64 %14)
%16 = call i64 @scanf(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str, i64 0, i64 0), i64* %1, i64* %2)
%17 = load i64, i64* @EOF
%18 = icmp eq i64 %16, %17
br i1 %18, label %19, label %8
19: ; preds = %8, %0
ret i32 0
}