为啥编译失败啊

a=input()
if a=='a'
    print('A')
if a=='b'
    print('B')
if a=='c'
    print('C')
if a=='d'
    print('D')
if a=='e'
    print('E')
if a=='f'
    print('F')
if a=='g'
    print('G')
if a=='h'
    print('H')
if a=='i'
    print('I')
if a=='j'
    print('J')
if a=='k'
    print('K')
if a=='l'
    print('L')
if a=='m'
    print('M')
if a=='n'
    print('N')
if a=='o'
    print('O')
if a=='p'
    print('P')
if a=='q'
    print('Q')
if a=='r'
    print('R')
if a=='s'
    print('S')
if a=='t'
    print('T')
if a=='u'
    print('U')
if a=='v'
    print('V')
if a=='w'
    print('W')
if a=='x'
    print('X')
if a=='y'
    print('Y')
if a=='z'
    print('Z')