s = "Henan Polytechnic Institute"
print(s.find("e"))
print(s.rfind("e"))

print(s.index("e"))
print(s.rindex("e"))

print(s.find("q"))
print(s.index("q"))

try:
    print(s.find("q"))
    print(s.index("q"))
except ValueError:
    print("Substring not found")