def func(l):
    d = dict()
    for each in l:
        if each not in d:
            d[each] = 1
        else:
            d[each] += 1
    new = [m for m,n in d.items() if n == 2]
    return new

def func(a,b,c):
    with open(a,'r') as f:
        stra = f.readline()
    with open(b,'r') as f:
        strb = f.readline()
    new = ''.join(reversed([stra,strb]))
    with open(c,'w') as f:
        f.write(new)

strs = input('请输入字符：')
try:
    new = strs.upper()
except Exception as e:
    print(e)
else:
    with open('test.txt','w',encoding='utf-8') as f:
        f.write(new)