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- #include <bits/stdc++.h>
- using namespace std;
- int main ()
- {
- int i,len,flag=0;
- string s;
- cin>>s;
- len=s.length();
- for(i=0;i<len;i++)
- {
- if(len==1 && isdigit(s[0]))
- {
- flag=1;
- }
- else if(i%2==1)
- {
- if(s[i]=='+' || s[i]=='-')
- flag=1;
- else
- flag=0;
- }
- else if( (i%2==0 && !isdigit(s[i]) ) )
- {
- flag=0;
- }
- if(!isdigit(s[len-1]))
- flag=0;
- }
- if(flag==1)
- cout<<"This is CFG";
- else if(flag==0)
- cout<<"This is not CFG";
- return 0;
- }
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