diff --git a/argorithm/coin.py b/argorithm/coin.py
new file mode 100644
index 0000000..0a7040f
--- /dev/null
+++ b/argorithm/coin.py
@@ -0,0 +1,9 @@
+def solution(money, expected, actual):
+    answer = -1
+    
+    return answer
+
+
+if __name__ == '__main__':
+    real_answer = solution(1000, ['H', 'T', 'H', 'T', 'H', 'T', 'H'], ['T', 'T', 'H', 'H', 'T', 'T', 'H'])
+    print(real_answer)
\ No newline at end of file
diff --git a/argorithm/grades.py b/argorithm/grades.py
new file mode 100644
index 0000000..c6c002d
--- /dev/null
+++ b/argorithm/grades.py
@@ -0,0 +1,7 @@
+def solution(grades, weights, threshold):
+    answer = -1234567890
+    grade_weight = [{'A+':10}, {'A0':9}, {'B+':8}, {'B0':7}, {'C+':6}, {'C0':5}, {'B+':4}, {'B0':3}, {'F':0}]
+    return grade_weight
+
+if __name__ == '__main__':
+    real_answer = solution(['A+', 'D+', 'F', 'C0'], [2, 5, 10, 3], 50)
\ No newline at end of file
diff --git a/argorithm/str_split.py b/argorithm/str_split.py
new file mode 100644
index 0000000..2a81633
--- /dev/null
+++ b/argorithm/str_split.py
@@ -0,0 +1,15 @@
+def solution(s, op):
+    answer = []
+    s_list = list(s)
+    for i in range(len(s_list)-1):
+        s_left = int(''.join(map(str, s_list[:i+1])))
+        print('s_left : ', s_left)
+        s_right = int(''.join(map(str, s_list[i+1:])))
+        print('s_right : ', s_right)
+        answer.append(s_left + s_right)
+    return answer
+
+
+if __name__ == '__main__':
+    real_answer = solution('1234','+')
+    print(real_answer)
\ No newline at end of file