diff --git a/10/cpu.py b/10/cpu.py
new file mode 100644
index 0000000..e3e00ea
--- /dev/null
+++ b/10/cpu.py
@@ -0,0 +1,42 @@
+
+import fileinput
+
+class CPU:
+
+    def __init__(self):
+        self.reg_x = 1
+        self.cycle = 0
+
+    def draw(self):
+        pos = self.cycle - 1
+        if pos % 40 == 0 and pos != 0:
+            print('')
+        print("#" if abs((pos % 40) - self.reg_x) <= 1 else ".", end='')
+        if self.cycle == 240:
+            print("")
+    
+    def exec(self, instructions, breaks=[]):
+        for instruction in instructions:
+            # print(f"Start cycle {self.cycle:3d}: begin executing {instruction}")
+            if instruction == "noop":
+                self.cycle += 1
+                if self.cycle in breaks:
+                    yield self.cycle*self.reg_x
+                self.draw()
+            elif instruction.startswith("addx"):
+                self.cycle += 1
+                if self.cycle in breaks:
+                    yield self.cycle*self.reg_x
+                self.draw()
+                self.cycle += 1
+                if self.cycle in breaks:
+                    yield self.cycle*self.reg_x
+                self.draw()
+                self.reg_x += int(instruction.split(' ')[1])
+            else:
+                print("Unknown instruction")
+
+if __name__ == "__main__":
+    cpu = CPU()
+    print(f"Solution A: {sum(cpu.exec(filter(lambda x: x != '', map(lambda x: x.strip(), fileinput.input())), [20, 60, 100, 140, 180, 220]))}")
+    
diff --git a/10/example b/10/example
new file mode 100644
index 0000000..37ee8ee
--- /dev/null
+++ b/10/example
@@ -0,0 +1,146 @@
+addx 15
+addx -11
+addx 6
+addx -3
+addx 5
+addx -1
+addx -8
+addx 13
+addx 4
+noop
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx 5
+addx -1
+addx -35
+addx 1
+addx 24
+addx -19
+addx 1
+addx 16
+addx -11
+noop
+noop
+addx 21
+addx -15
+noop
+noop
+addx -3
+addx 9
+addx 1
+addx -3
+addx 8
+addx 1
+addx 5
+noop
+noop
+noop
+noop
+noop
+addx -36
+noop
+addx 1
+addx 7
+noop
+noop
+noop
+addx 2
+addx 6
+noop
+noop
+noop
+noop
+noop
+addx 1
+noop
+noop
+addx 7
+addx 1
+noop
+addx -13
+addx 13
+addx 7
+noop
+addx 1
+addx -33
+noop
+noop
+noop
+addx 2
+noop
+noop
+noop
+addx 8
+noop
+addx -1
+addx 2
+addx 1
+noop
+addx 17
+addx -9
+addx 1
+addx 1
+addx -3
+addx 11
+noop
+noop
+addx 1
+noop
+addx 1
+noop
+noop
+addx -13
+addx -19
+addx 1
+addx 3
+addx 26
+addx -30
+addx 12
+addx -1
+addx 3
+addx 1
+noop
+noop
+noop
+addx -9
+addx 18
+addx 1
+addx 2
+noop
+noop
+addx 9
+noop
+noop
+noop
+addx -1
+addx 2
+addx -37
+addx 1
+addx 3
+noop
+addx 15
+addx -21
+addx 22
+addx -6
+addx 1
+noop
+addx 2
+addx 1
+noop
+addx -10
+noop
+noop
+addx 20
+addx 1
+addx 2
+addx 2
+addx -6
+addx -11
+noop
+noop
+noop