"""Enter String as Full form"""
arr = [(arr_temp) for arr_temp in input().strip().split(' ')]
"""Remove Noise"""
"""Enter Noise words as needed"""
noise = ['of','and']
for x in noise:
    if x in arr:
        arr.remove(x)
abbrev = []
for y in arr:
    abbrev.append(y[0])
print(''.join(abbrev))