diff --git a/berkely/1991 YSU-ACM High School Programming Contest/4/input b/berkely/1991 YSU-ACM High School Programming Contest/4/input
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+C793A
+B83B5
+4ABAC
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diff --git a/berkely/1991 YSU-ACM High School Programming Contest/4/main.py b/berkely/1991 YSU-ACM High School Programming Contest/4/main.py
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+++ b/berkely/1991 YSU-ACM High School Programming Contest/4/main.py	
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+import sys, os
+
+def evaluate(patterns, a, b, c):
+    mapping = str.maketrans('ABC', str(a) + str(b) + str(c))
+    x, y, z = patterns[0].translate(mapping), patterns[1].translate(mapping), patterns[2].translate(mapping)
+    x, y, z = int(x), int(y), int(z)
+    if x + y == z:
+        return [x, y, z]
+    
+def main():
+    # Read Input Data
+    path = os.path.join(sys.path[0], 'input')
+    data = open(path, 'r').read().split('\n')
+
+    # Just cycle through all iterations until one is found.
+    for x in range(10):
+        for y in range(10):
+            for z in range(10):
+                result = evaluate(data, x, y, z)
+                if result:
+                    return result
+
+if __name__ == "__main__":
+    print(main())
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diff --git a/berkely/1991 YSU-ACM High School Programming Contest/README.MD b/berkely/1991 YSU-ACM High School Programming Contest/README.MD
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+# 1991 YSU-ACM High School Programming Contest
+
+These problems honestly seem extraordinarily easy, but it's likely do to the constraints of computer programming back then. Kind of cheating, using Python.
+
+[Official Link](https://people.eecs.berkeley.edu/~hilfingr/programming-contest/ysu_91.pdf) | [GitHub Mirror](./ysu_91.pdf)
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diff --git a/berkely/1991 YSU-ACM High School Programming Contest/problem4.py b/berkely/1991 YSU-ACM High School Programming Contest/problem4.py
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diff --git a/berkely/1991 YSU-ACM High School Programming Contest/ysu_91.pdf b/berkely/1991 YSU-ACM High School Programming Contest/ysu_91.pdf
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