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#include<iostream> #include<cstdio> #include<cmath> #include<cstring> using namespace std; int main() { char s[100000]; int c,b,i,d; cin>>s; b=strlen(s); c=-10000; for(i=0;i<b;i++) { if(s[i]=='.') { i++; continue; } if(s[i]>c) { c=s[i]; } } cout<<(char)(c); return 0; }