C++ EXERCISES Name initials - working with strings

This exercise was on Harvard`s problem set (from CS50). The program should take a string from user as an input and then output the first letters of name and last name a.k.a. - initials. For example: John Smith will turn into JS and so on.
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[MuhammadIjaz-fprt]

I have a problem in this regard

i have made same like u . but when i run

it shows

Enter your full name: ijaz sharif
then i press enter it stops and not shows the alphabtes of my name

help